<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.4"/>
<title>gbmath: first_person_camera.cpp Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  <td id="projectlogo"><img alt="Logo" src="logo.jpg"/></td>
  <td style="padding-left: 0.5em;">
   <div id="projectname">gbmath
   &#160;<span id="projectnumber">v0.051</span>
   </div>
   <div id="projectbrief">c++ math library</div>
  </td>
 </tr>
 </tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.4 -->
  <div id="navrow1" class="tabs">
    <ul class="tablist">
      <li><a href="index.html"><span>Main&#160;Page</span></a></li>
      <li><a href="pages.html"><span>Related&#160;Pages</span></a></li>
      <li><a href="namespaces.html"><span>Namespaces</span></a></li>
      <li><a href="annotated.html"><span>Classes</span></a></li>
      <li class="current"><a href="files.html"><span>Files</span></a></li>
    </ul>
  </div>
  <div id="navrow2" class="tabs2">
    <ul class="tablist">
      <li><a href="files.html"><span>File&#160;List</span></a></li>
      <li><a href="globals.html"><span>File&#160;Members</span></a></li>
    </ul>
  </div>
</div><!-- top -->
<div class="header">
  <div class="headertitle">
<div class="title">first_person_camera.cpp</div>  </div>
</div><!--header-->
<div class="contents">
<a href="first__person__camera_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160; </div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;</div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="__gbmath_8h.html" title="MAIN INCLUDE HEADER. ">_gbmath.h</a>&quot;</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="base__camera_8h.html" title="Basic camera to handle window messages windows. only windows platform     ">base_camera.h</a>&quot;</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;</div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="keyword">namespace </span>gbmath</div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;{</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160; </div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;first_person_camera::first_person_camera() :</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;    m_nActiveButtonMask( 0x07 )</div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;{</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;    m_bRotateWithoutButtonDown = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;}</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="keywordtype">void</span> first_person_camera::frameMove( <span class="keywordtype">float</span> fElapsedTime )</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;{</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160; </div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;    <span class="keywordflow">if</span>( isKeyDown(m_aKeys[CAM_RESET]) )</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;        reset();</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;    <span class="comment">// Get keyboard/mouse/gamepad input</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;    getInput( m_bEnablePositionMovement,</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        (m_nActiveButtonMask &amp; m_nCurrentButtonMask) || m_bRotateWithoutButtonDown, </div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;        <span class="keyword">true</span>, m_bResetCursorAfterMove );</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    <span class="comment">// Get amount of velocity based on the keyboard input and drag (if any)</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    updateVelocity( fElapsedTime );</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    <span class="comment">// Simple euler method to calculate position delta</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    vec3 vPosDelta = m_vVelocity * fElapsedTime;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    <span class="comment">// If rotating the camera </span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    <span class="keywordflow">if</span>( (m_nActiveButtonMask &amp; m_nCurrentButtonMask) || </div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        m_bRotateWithoutButtonDown || </div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        m_vGamePadRightThumb.x != 0 || </div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        m_vGamePadRightThumb.z != 0 )</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    {</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;        <span class="comment">// Update the pitch &amp; yaw angle based on mouse movement</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        <span class="keywordtype">float</span> fYawDelta   = m_vRotVelocity.x;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        <span class="keywordtype">float</span> fPitchDelta = m_vRotVelocity.y;</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        <span class="comment">// Invert pitch if requested</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        <span class="keywordflow">if</span>( m_bInvertPitch )</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;            fPitchDelta = -fPitchDelta;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        m_fCameraPitchAngle += fPitchDelta;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        m_fCameraYawAngle   += fYawDelta;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">float</span> __PI_DIV2 = 3.141592654f / 2.0f;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;        <span class="comment">// Limit pitch to straight up or straight down</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;        m_fCameraPitchAngle = __max( -__PI_DIV2,  m_fCameraPitchAngle );</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;        m_fCameraPitchAngle = __min( +__PI_DIV2,  m_fCameraPitchAngle );</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    }</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;    <span class="comment">// Make a rotation matrix based on the camera&#39;s yaw &amp; pitch</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    mat44 mCameraRot;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    mCameraRot.setRotationYawPitchRoll( m_fCameraYawAngle, m_fCameraPitchAngle, 0.0f  );</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="comment">// Transform vectors based on camera&#39;s rotation matrix</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    vec3 vWorldUp, vWorldAhead;</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    vec3 vLocalUp    = vec3(0,1,0);</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    vec3 vLocalAhead = vec3(0,0,1);</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    vWorldUp = vLocalUp;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    vWorldUp.transform_coord(mCameraRot);</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    vWorldAhead = vLocalAhead;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    vWorldAhead.transform_coord(mCameraRot);</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    <span class="comment">// Transform the position delta by the camera&#39;s rotation </span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    vec3 vPosDeltaWorld;</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    <span class="keywordflow">if</span>( !m_bEnableYAxisMovement )</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    {</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        <span class="comment">// If restricting Y movement, do not include pitch</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        <span class="comment">// when transforming position delta vector.</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        mCameraRot.setRotationYawPitchRoll(m_fCameraYawAngle, 0.0f, 0.0f  );</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    }</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    vPosDeltaWorld =   vPosDelta;</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    vPosDeltaWorld.transform_coord(mCameraRot);</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    <span class="comment">// Move the eye position </span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    m_vEye += vPosDeltaWorld;</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    <span class="keywordflow">if</span>( m_bClipToBoundary )</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        constrainToBoundary( &amp;m_vEye );</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    <span class="comment">// Update the lookAt position based on the eye position </span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    m_vLookAt = m_vEye + vWorldAhead;</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    <span class="comment">// Update the view matrix</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    m_mView.setViewLookAtLH(  m_vEye, m_vLookAt, vWorldUp  );</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    m_mCameraWorld = m_mView.inverted();</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;}</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="keywordtype">void</span> first_person_camera::setRotateButtons( <span class="keywordtype">bool</span> bLeft, <span class="keywordtype">bool</span> bMiddle, </div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;                                           <span class="keywordtype">bool</span> bRight, </div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;                                           <span class="keywordtype">bool</span> bRotateWithoutButtonDown )</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;{</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    m_nActiveButtonMask = ( bLeft ? MOUSE_LEFT_BUTTON : 0 ) |</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;                          ( bMiddle ? MOUSE_MIDDLE_BUTTON : 0 ) |</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;                          ( bRight ? MOUSE_RIGHT_BUTTON : 0 );</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    m_bRotateWithoutButtonDown = bRotateWithoutButtonDown;</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;}</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160; </div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;}</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;</div>
</div><!-- fragment --></div><!-- contents -->
<hr class="footer"/>
<!--address class="footer"-->
<!--small-->
<br>
&nbsp;&nbsp;&nbsp;<b>Project page:</b> &nbsp;<a target="_blank" href="https://code.google.com/p/gbmath/">https://code.google.com/p/gbmath/</a>&nbsp;&nbsp;<br>
&nbsp;&nbsp;&nbsp;<b>Doc page:</b> &nbsp;<a target="_blank" href="http://www.it.ks777.ru/docs">http://www.it.ks777.ru/docs</a>&nbsp;&nbsp;<br>
<br>
Generated on Sat Jul 27 2013 08:09:04 for gbmath by &#160;
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.4
